Mike Tolbert limped off the field with a lower right leg injury deep in the fourth quarter of Sunday's game against the Vikings. Tolbert was laying on his back on the trainers table with medical personnel looking at his right knee. He had been the Chargers' key red-zone weapon throughout the game, tallying three touchdowns and 93 yards on 12 carries and nine receptions. A multi-week injury would catapult Ryan Mathews into RB1 territory in an effective offense.